Processing device, transmitter, base station, mobile device, method and computer program

1. A processing device, comprising one or more interfaces configured to transmit information to a nonlinear device; and processing circuitry configured to control the one or more interfaces and to: transmit an excitation signal to the nonlinear device; receive response information from the nonlinear device; determine a linear response of the nonlinear device based on the response information; determine a nonlinear response of the nonlinear device based on the determined linear response; and receive a training feedback signal for providing a feedback of the response of the nonlinear device to the processing device from a feedback device, wherein a transmission rate of the training feedback signal is lower than a transmission rate of the excitation signal.

2. The processing device according to claim 1, wherein the processing circuitry is further configured to determine a predistortion function based on the determined nonlinear response.

3. The processing device according to claim 2, wherein the processing circuitry is further configured to: generate a pre-distorted digital signal based on the predistortion function; and transmit the pre-distorted digital signal to the nonlinear device to enable the nonlinear device to compensate nonlinear behavior.

4. The processing device according to claim 3, wherein the processing circuitry is further configured to receive a feedback signal for providing a feedback of the performance of the pre-distorted digital signal to the processing device from a feedback device and wherein a transmission rate of the feedback signal is lower than a transmission rate of pre-distorted digital signal.

5. The processing device according to claim 1, wherein the excitation signal is a small wideband signal.

6. A transmitter, comprising: a processing device comprising processing circuitry, the processing device configured to: transmit an excitation signal to a nonlinear device; receive response information from the nonlinear device; determine a linear response of the nonlinear device based on the response information; and determine a nonlinear response of the nonlinear device based on the determined linear response; and a nonlinear system, comprising: the nonlinear device configured to: receive a pre-distorted digital signal from the processing device; and generate an analog signal based on the pre-distorted digital signal; and a feedback loop for providing a digital feedback signal to the processing device, wherein the feedback loop comprises an analog-to-digital converter configured to generate the digital feedback signal based on the analog signal, and wherein a sample rate of the analog-to-digital converter is lower than a sample rate of the digital-to-analog converter.

7. The transmitter of claim 6, wherein the processing device is further configured to generate the predistortion function based on data to be wirelessly transmitted.

8. The transmitter of claim 6, wherein the nonlinear system is a digital-to-analog conversion system.

9. The transmitter of claim 6, further comprising a power amplifier coupled to the digital-to-analog converter and configured to amplify the analog signal for generating an amplified signal; wherein the feedback loop comprises an analog-to-digital converter configured to generate the digital feedback signal based on the amplified signal.

10. A base station, comprising: a transmitter according to claim 6; and at least one antenna element coupled to the nonlinear system.

11. The base station of claim 10, further comprising a receiver configured to receive a radio frequency receive signal from the antenna element.

12. A mobile device, comprising a transmitter according to claim 6.

13. The mobile device of claim 12, further comprising a receiver configured to receive a RF receive signal from an antenna element coupled to a nonlinear system.

14. A method, comprising transmitting an excitation signal to a nonlinear device; receiving response information from the nonlinear device; determining a linear response of the nonlinear device based on the response information; determining a nonlinear response of the nonlinear device based on the determined linear response; and receiving a training feedback signal for providing a feedback of the response of the nonlinear device to the processing device from a feedback device, wherein a transmission rate of the training feedback signal is lower than a transmission rate of the excitation signal.

15. The method according to claim 14, further comprising determining a predistortion function based on the determined nonlinear response.

16. The method according to claim 15, further comprising generating a pre-distorted digital signal based on the predistortion function; and transmitting the pre-distorted digital signal to the nonlinear device to enable the nonlinear device to compensate nonlinear behavior.

17. The method according to claim 16, further comprising receiving a feedback signal for providing a feedback signal of the performance of the pre-distorted digital signal to the processing device from a feedback device and wherein a transmission rate of the feedback signal is lower than a transmission rate of the pre-distorted digital signal.

18. The method according to claim 14, wherein the excitation signal is a small wideband signal.

19. A non-transitory, computer-readable medium comprising a program code that, when the program code is executed on a computer, a processor, or a programmable hardware component, performs the method according to claim 14.